Version: (using KDE Devel) Installed from: Compiled sources Umbrello currently only supports asynchronous messages and message-to-self. It would be desirable to have synchronous messages between user selectable objects in the sequence diagram.
Huh? Both asynchronous and synchronous messages are both possible as message to self or message to another object.
Wha! Forget it. It works now for me. (Maybe it had something to do with the way I clicked the mouse.)